No, sex within marriage does not lead to a culture of hedonism. Marriage is part of God’s plan and sex within that context is always virtuous— assuming no-fault divorce is eliminated, which just turns marriage into serial adultery. For men of virtue, the purpose of marriage is much greater than sex, but my comment was intended to mean that even for men of lesser virtue, sex was only culturally acceptable within the bounds of marriage, so they were forced to become virtuous by accepting monogamy.
The way you framed it was that men got married to “get sex”. There was no mention of lofty goals that you are now mentioning.